Z94.12.6 Plastics

FABRICATING; FABRICATION. The manufacture of plastic products from molded parts, rods, tubes, sheeting, extrusions, or other forms by appropriate operations such as punching, cutting, drilling, and taping. Fabrication includes fastening plastic parts together or to other parts by mechanical devices, adhesives, heat-sealing, or other means.

FACE. In plywood manufacture, the veneer on the exposed surface of the plywood.

FALSE BODY. The deceptively high apparent viscosity of a pseudoplastic fluid at a low rate of shear.

FAMILY MOLD. A multicavity mold containing individual cavities of different sizes or designs.

FILLER. An inert substance added to plastics resin to reduce cost and improve physical properties. The filler particles usually are small, in comparison to those used in reinforcements, but there is some overlap between the two additives.

FILLER-SPECKS. Visible specks of a filler, such as woodflour or asbestos, which stand out in color contrast against the background.

FILM. (1) Sheeting having a nominal thickness not greater than 0.010 in. (2) In adhesives, a thin, dry sheet of paper impregnated with a phenol-formaldehyde resin adhesive. Film sometimes is used to refer to a liquid coating of adhesive.

FIN. That part of the flash which remains attached to the molded article.

FINISHING. The removal of defects or development of desired surface characteristics on plastic products.

FISHEYE. Small globular mass which has not blended completely into the surrounding material; particularly evident in a transparent or translucent material.

FLAKE. The dry, unplasticized base of cellulose plastics.

FLASH. That portion of the charge which flows from or is extruded from the mold cavity during the molding.

FLASH RIDGE. That part of a flash mold along which the excess material escapes until the mold is closed.

FLAT GRAIN. Grain produced in approximately a tangential direction, or plain-cs veneers.

FLOATING CHASE. Mold member, free to move vertically, which fits over a lower plug or cavity, and into which an upper plug telescopes.

FLOCK. Short fibers of cotton and other materials, used as fillers for molding materials.

FLOW MARK. A visible mark resulting from the solidification of a pattern of flow.

FLUOROCARBONS. The family of plastics including polytetrafluoroethylene (PTFE), polychlorotri-fluorethylene (PCTFE), polyvinylidence and fluorinated ethylene propylene (FEP).

FLUXING TEMPERATURE. (See FUSION TEMPERATURE.)

FOAM. (See CELLULAR PLASTIC.)

FOAMED PLASTICS. Resins in sponge form.

FOAM MOLDING. A molding process whereby heat-softened plastics containing a foaming (blowing) agent are injection molded into a cavity where they harden to produce a product that has a solid skin contiguous with a foam core. (See STRUCTURAL FOAM, SANDWICH MOLDING.)

FORCE, FORCE PLUG. The force is the member which transmits the pressure from the press unit to the top of the molding charge. In positive molds, there is an extension to or protuberance beneath the force which telescopes within the molding cavity (or loading chamber) and which is termed a force plug (compression molding). (When used in reference to injection molding, See CORE.)

FORMING. A process in which the shape of plastic pieces such as sheets, rods, or tubes, is changed to a desired configuration. The use of the term forming in plastics technology does not include such operations as molding, casting, or extrusion, in which shapes or articles are made from molding materials or liquids.

FURANE PLASTICS. Plastics based on resins in which the furane ring is an integral part of the polymer chain, made by the polymerization or polycondensation of furfual, furfuryl alcohol, or other compounds containing a furane ring, or by the reaction of these furane compounds with not more than an equal weight of other compounds. Furane is also spelled furan.

FUSION. In vinyl dispersions the heating of a dispersion to produce a homogeneous mixture. There is an apparent mutual solvation of the resin and plasticizer.

FUSION TEMPERATURE. In vinyl dispersions the temperature at which fusion occurs; also called fluxing temperature.